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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f91cb8560e907f720e0a696365f2d13a074e0e993aab30cfd37a8aadc95f008' 
  AND token = 'Tp2mFPIY+WCa+siUVpu6HurbS/MHsQ+HEJkNiFCGyWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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