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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38160195ab57e1100e1c2fee3b31ec152b96572a6fe78596236fc6a1f071a69e' 
  AND token = 'j1qYTqLxVRg2SBY224c6ke3mZrDL4OfY7fweHPDjgIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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