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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a47434618d0f8978de62b3326942450bb495d4f7553306ff85d8c4a3179f724' 
  AND token = 'TObGVHs+I/xB5mWOb2aPLsG85uMATndH3z6Ikfq5u9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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