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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8e5b023aba766f1f7efb15a4ac9062888567c02b2c796e05c73d48faefa7e1e' 
  AND token = 'vDQeXhZIGsl0z3G6ZpkTBv4qeJ7gilFyWgerQDviC2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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