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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d0a4068ec7d59d81e67f5f8f40aa96eddd23b972bf2fab60ee35a715b003a77' 
  AND token = 'LjLTUpEdzNeny9EuAtR2RSlKHt6JPgfAAdL+fok1KxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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