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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd8524b970d68779bb2bea65069cffd84ff58dd4f004154f9232d64b918e97fa' 
  AND token = '5dH7SzxdAWzEMaH1JrQ+sWCICtGmOHaFDPRR/sr0jNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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