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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9db15af8b4aa882dfeb3d4f4e0d5284244b798e96ae4b2c71589a9ab807ed7a' 
  AND token = 'otUAciL3IGQrbKUJTNX9pXDsBLPmhx3ZuyIZikylF1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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