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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6933f25ab5e090da40dd91e6d3d83e21ebb5ec7841579e11b8842b6dcecf6adb' 
  AND token = 'iCd0gYImjfdSIriRUPEJ5wRsX86I4Sr9QpaEWdbGcJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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