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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b70abedbc29b5b827d4596175a6e6be2596aa331c8d0a8ad881b135b3b30de0a' 
  AND token = 'N3rz/jJ6EAHbfuvFSqjmkT0W4QC9F6UwTwVFpOmWhfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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