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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63bad45fb4bd2cdf5a523e9128e49b01744313433f1a3bd3afe7b0a8991b3243' 
  AND token = 'KlFXktnYONbGF2124XgE/zIRfi7j2xxTy8fAMBCg7fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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