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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd234e7c08afb753d82ce9a1312d8c3d8ea703fbe59bbca934cd7da2f0410f210' 
  AND token = '+PuI6xi5Admahm2Nf+dJjIaK9H/C/zU45FvOL8DBSpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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