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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d62c634b816c7fb1789d08a33e41bb889ed93afecdc528a1eeb376f0545cba' 
  AND token = 'MzYnoKwm44zB3qFEnlsOLyJKLNtGzbLLir0yRCrEM5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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