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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da569a095877ea9291ff43eac8cf927479bc6407f06526d58c192a0150a6aa0b' 
  AND token = '7lCa7AKPgCOc3MWE5Ci09Iql8itGfU35UzvQQ71o0gA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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