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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1ba96f2dce897ea4b9efe2a298bf1879eef52981242566cf60cab9e82ec75b9' 
  AND token = 'tICPZ64d7Hs+eaFwpqd4OIMeOs3t92eRw5/xia41ONc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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