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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2e52792ed7ef29602461e090e7346b04addba258748bfdc18bc872772cbc0b3' 
  AND token = 'M/smNcwaZbWYrs6tpUJijqgTs7AEsNFjq92P+54eUds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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