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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8081da4898458d21c2437b88dcf784c5c11de58e2545d6cdb70e75d02a79dc8e' 
  AND token = 'EDEbDD5hzt4JI6WhSlAs2RkHC+CsMVglllTZuGufs2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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