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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edd7036242c9124c046fb8902d67d8704143d7f0e7b3e5b9e6fdeee59dc996b1' 
  AND token = 'u20bzNP3R5JX6epKGvhvNZHJ02k1vitUIk3AqFh+Xxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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