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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '298ef7bba29236ca3a6cf325dbdb9cc0f90a74fe5c4b279047e1bd35e3ff243b' 
  AND token = 'AZaqx4sdjCD0mb9z8KLCNU0e4lV0FnGQyzeyFZzGxFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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