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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ef097ea899739cccea99a5d79a94bddbbe12efd3664ec116091c73e7cf1b766' 
  AND token = 'c373PDCNCC3adiUC0po2wHmyGKx/ghk17kIErZAAYTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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