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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70c7e8011cb4030a2df4f1b1c100508940b7614d6707caef2d2857492a8ca117' 
  AND token = 'UD+e3S+I+ElwJI2jHAzgsWI1RO4c16LS38ds/Vt+SI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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