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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df57564ae7661a9d2e1739d89010732e1c95b9ce4426cc21db813fe047829539' 
  AND token = 't1vLnkGj0xUNse/i/g6h8soiLwEQFPJQUrf5tf0gFus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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