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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5596a5eb6a552a417f450f34f4fbc050b78a8d622a401afc82b2bee83c0a7d0' 
  AND token = 'rWu9rbv9UIE3aFjzKwYx2+qkroNG7QKzlKPw2aaEsj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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