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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea5cab68d028351b6914a83c1153b353f940968ce321780b463530d6792002f' 
  AND token = 'ViyLNy9xxRMl9LDgvGe/EPsjd35oroZ8LtzKeKmSzNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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