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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde872965a4b76841ea0aa0239765f8994e4521974ef931c4203d382db7fcdcc' 
  AND token = '9gjg3j/1bAyaUxWawBk7tECF1XLuFgdvODe9oeOxsAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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