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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '986f4af46e5ab0cab7224579ce9f0aed57f531bce1358a8386f6e5cc904feab7' 
  AND token = 'Y36bSfchez8zNnn6L8ZT8lY08wCgeA1sr7isKd+mQYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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