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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '912f6f56024a38f6da9a1d102e2d363ea0682fb06e7390827b26d6ddc840bd83' 
  AND token = 'zkcPV4Luj1VwfwQvDWAJdOxfyBJj+iSpXevosE33u8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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