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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a13afbe4da29e9c12944ad6d1c72becc569e446e7fd8c5977607ebc4c35e60a' 
  AND token = 'ENZDi7DXRPGKenikY0Ieor5IE55ZfMH/O9r3i5HCgOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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