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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22ce80a02ecf898d9a5bef1aadcef137dbd6615b2da16de72c1ae9b9044df230' 
  AND token = 'Y99z6Ya1GoykFvYw4b4W/gVHZ/pUQIQukqop/6suuvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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