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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1474bb7701e3181a4a94b134d64453f54afa701076ff94f2305e6f28d093b76a' 
  AND token = 'gQqiEEqjivLm/Vp542S0b0J9aGJvDXtnw0USti46C/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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