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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a198d1104c1e6ad3fe4aa495e60068f611f812e2bb2c5ffd847794d586b9001' 
  AND token = '6SUiOp9Nfq+lYgcsR5aSaij2lugfisNOgDNCpjPcvwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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