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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1382b4b8be6c699beb217c9374519e508be7d0aad7ccc5c58cf45e5dc02c759a' 
  AND token = '2aon1M4rx30a2eb/ohVylVPT9yOugS93Dy9OwOL5Knk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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