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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fabaace5ca4b05e2ed1a279ba858c7d21a8038e0f3f5ab335e967e87c027132' 
  AND token = 'I2pKNq5Q/esEq8IDg5TKYGPxz6KknEMVx0866wZUYJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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