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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a21b868f7970b0459d81b170ab31fc2bf6f44df80f48526911a5edaa219e65b' 
  AND token = 'peSBLdBGu9U6sEt++N2yFBJPN+oiUWgcDunO8pdoZ5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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