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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fd429bde9db57e2fb2a901eab6785a3c137fdf51de43d2c180af20909c9ccef' 
  AND token = '/t7WcfreSk5exdMu1wrKpZrQZSIXrc2DM90fAQ/5j74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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