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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8f1326c75fcf88aa12f036b0d05e0b9da962fef99652ddab787e75d5a30c720' 
  AND token = '7ZMibrqABIMMGmhVblR58f0bxAY7hpIJpIz3NMwbh18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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