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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ceeaba3667a04cf1b798ed7e250ffce20fac3a11ee79ea2e44cb81e29b487e' 
  AND token = 'nrnghZkyZ3gvgOb2FLRCOw3PFz8v9wPzpq1YIgAOx0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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