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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3298b9506db68aef6057c06dd06d9636ba04b93ddad356c090e71a31add2f2ac' 
  AND token = 'qcNJhwtgNtXHI4v4ei5fND5iHNJup9XFB1sQi9ybMMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}