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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b82d85e6a731bb19ac996e68ac2a4c6d35de2071b3d42ad6e17f5843fcb32b2' 
  AND token = 'KqNitZm/6eDjISlIKOsd3a/+OtoJbQCj+Ye45s1Ab0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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