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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f63242ed7e055cb82fd559c94001399d77de96df8d42774c5380347140613e' 
  AND token = 'vT6MVJ/6McZSPCM22p2fQzrLf/7zrwnSZISny9PwRR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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