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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd44f2b412c7fa8410f7ca21bc02b428f6489e80ca97c1125b69dbe806f98930b' 
  AND token = '5bD9B3AsFWxiprsM3iTAFKgS00s9hp7kxJtnXyfI9E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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