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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca0fd82c787e0af314cb52c0bb38ef676ef515b6eb02e9b967b5bd06f9d364aa' 
  AND token = 'Yrrk0Wl3hfGL//MSyPVVV3oUexeQ7np2x2bzXYjwIFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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