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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94cd070ca30c93aecf23ba7328247d4258a0598ef2a053cf3e39d9a1c22801b3' 
  AND token = 'ytqQVrububtsBO4mOnEgDLTzfmDfn/jUjr5mdE4CZAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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