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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8dad234e0724d00c2ee2321bdb5ff3019605dd43c72d71ca98f7d62f972a073' 
  AND token = 'ooxQwqklEdi4wrTErkqANl0qQj8EH8AIQ5vTJxDgEgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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