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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1a37f148fc41cf43c226b5ce8c4eaf75246dbb0eae643e731d0ca57ccf7f2a0' 
  AND token = 'ORcuM6TNgGvnZhldaxGEgyCtAj82/PwtHD4laN5CybA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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