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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab7c972a1cb2272f7a87e43fdc92db5225ffcda512367acefad31989bd53c8f4' 
  AND token = '7yX1zhfzdABQrSQg/9KD/1piLTzCQ1Ks75t/VKAgCRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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