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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e10f7a6cbe7f7f1a8fa4516a41e3ad749c9436013ea6d4a417858c431ff7d1' 
  AND token = 'LNlMdww4z/3NilhCDtlDyWDWZBMhSylQa3Jep2KBS9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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