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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bde4c70ef0d5fe28e158f2709e0997d850cd7ee6d5e77ecf34bbc044aa41504' 
  AND token = 'jt4JZw95iXVzSqCGMduLYvrIUjix8Y6jaaw+sRW3gSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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