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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '637ddfd493d6d5a0b764db4bd4ea4c1e645f633584a4b0cc6c5fc137bd7ded06' 
  AND token = '4tZ8zepjhe+SmZkG9fQ6dJq/QkjebBbV8HIiv/kH+cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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