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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2b14cdec02b50a8074146a32cf8b80fa6bc3c827b12f52158015ceb4a30de5f' 
  AND token = '/pIBXgTX0x2e4Erp2C6UeGm1FbjvvKww9Pl9x3vuRWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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