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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7d9ac13c230740d7d7ca8d03216f925c6695691e3984ed6fcff69db38d93052' 
  AND token = 'pvTsr79Zcdm5EI/ApIQQ3eLjLpplZLOBKU0TSpMoyrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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