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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a32622892e156fc7d0f9f1779c04af6bec4fd2ab2826b7f85e44a442969abdc' 
  AND token = '4zGf5ci+DziZQ5wcP54NbT0SnWjwejA+Py/zE65/3Gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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