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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c52503327ced972535ac5454f6739efb5c73e73f9bcafa88c613b043f21fd66' 
  AND token = 'KYdThzAHsMI1Vtvb3DoBb7M4Vaxkx9JpArxABdh1tVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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