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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09eeacc6d3a95e2c165de100685955dd6193efad825ce126b4d863f03e7958e0' 
  AND token = 'muzm5uH3nzRIsZbQ1RSn8lX8jTE8nYvHV76GPYqInLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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