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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3df7ae17db21324a39379969dbcd889173a92d9a0e3ec8117f14f848e0288d02' 
  AND token = '/mZn3vSpRbpcZZmyCkMNhbZPOVRijfNbTzPr3U7m7ZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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