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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be01065c865acd0f35af26eb1f02877e1990b16a5b936e4e117a252ef2262121' 
  AND token = '2LCkqDsuD3bpSTmZvrv99MdFylI0wwbb0drOIhHzRgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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